How can I effectively remove cat urine from walls and baseboards?

To effectively remove cat urine from walls and baseboards, start by mixing equal parts water and white vinegar in a spray bottle. Spray the affected areas generously and let it sit for 10-15 minutes. Then, wipe the walls and baseboards with a clean cloth or sponge. For stubborn stains, you can also use a mixture of baking soda and water to scrub the area before rinsing with the vinegar solution. Repeat the process as needed until the odor is gone.